基于PML井间可变交错网格的弹性波数值模拟  

BASED ON THE PERFECTLY MATCHED LAYER CROSS WELL SIMULATION OF ELASTIC WAVE WITH VARIABLE AND STAGGERED GRIDS

作　　者：李洋森[1] 孟凡顺[1] 李景岩[1] 张亮 

机构地区：[1]中国海洋大学海洋地球科学学院,山东青岛266100 [2]中海油湛江分公司,广东湛江524000

出　　处：《物探化探计算技术》2013年第2期168-174,118-119,共7页Computing Techniques For Geophysical and Geochemical Exploration

摘　　要：井间地震以其高精度和高分辨率的特点,正在成为解决构造精细成像、储层描述等问题的关键技术,这就需要高精度和高效率的正演模拟技术作为其有效辅助手段。这里基于非均匀介质理论基础的弹性波方程数值模拟方法,将可变交错网格引入到小尺度薄互层非均匀介质井间地震弹性波模拟,对不同尺度的地质体采用不同尺度的网格进行剖分模拟。数值模拟结果表明,可变交错网格在保证模拟精度的前提下,进一步提高了模拟的时效性和对复杂介质模型模拟的适应性,对研究精细的井间地震弹性波场特征和传播规律具有重要的作用。Crosswell seismic with the characteristics of high precision and high resolution is becoming the key technology solving the problem of structure fine imaging and reservoir description.It needs high accuracy and efficiency of the forward modeling technology as the effective assistant technique for analysis of the real underground seismic wave propagation and identifying complex wave field.According to elastic wave equation numerical simulation method,this paper introduced variable staggered grid technology into the research of crosswell seismic elastic wave simulation,especially for the studying of the small scale,thin interbed and so on.The different scales of geological body use the different scales on the grid division.Numerical simulation results show that variable staggered grids are effective to improve numerical efficiency under the precondition of high precision.The method improved the adaptability of numerical simulation for the complex medium.It has the vital role to study the characteristics of the subtle crosswell seismic wave propagation.

关 键 词：井间地震 可变网格 交错网格 PML 数值模拟 

分 类 号：P631.4[天文地球—地质矿产勘探]